Self-defense device for a key ring



FIG. 1 is a top front perspective view of a self-defense device for a key ring, showing my new design; and,

FIG. 2 is a bottom rear perspective view of the self-defense for a key ring thereof.

The broken line showing of two key rings and four keys in FIGS. 1 and 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a self-defense device for a key ring, as shown and described. 